Alex Lascarides


2017

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Evaluating Persuasion Strategies and Deep Reinforcement Learning methods for Negotiation Dialogue agents
Simon Keizer | Markus Guhe | Heriberto Cuayáhuitl | Ioannis Efstathiou | Klaus-Peter Engelbrecht | Mihai Dobre | Alex Lascarides | Oliver Lemon
Proceedings of the 15th Conference of the European Chapter of the Association for Computational Linguistics: Volume 2, Short Papers

In this paper we present a comparative evaluation of various negotiation strategies within an online version of the game “Settlers of Catan”. The comparison is based on human subjects playing games against artificial game-playing agents (‘bots’) which implement different negotiation dialogue strategies, using a chat dialogue interface to negotiate trades. Our results suggest that a negotiation strategy that uses persuasion, as well as a strategy that is trained from data using Deep Reinforcement Learning, both lead to an improved win rate against humans, compared to previous rule-based and supervised learning baseline dialogue negotiators.

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Grounding Symbols in Multi-Modal Instructions
Yordan Hristov | Svetlin Penkov | Alex Lascarides | Subramanian Ramamoorthy
Proceedings of the First Workshop on Language Grounding for Robotics

As robots begin to cohabit with humans in semi-structured environments, the need arises to understand instructions involving rich variability—for instance, learning to ground symbols in the physical world. Realistically, this task must cope with small datasets consisting of a particular users’ contextual assignment of meaning to terms. We present a method for processing a raw stream of cross-modal input—i.e., linguistic instructions, visual perception of a scene and a concurrent trace of 3D eye tracking fixations—to produce the segmentation of objects with a correspondent association to high-level concepts. To test our framework we present experiments in a table-top object manipulation scenario. Our results show our model learns the user’s notion of colour and shape from a small number of physical demonstrations, generalising to identifying physical referents for novel combinations of the words.

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Proceedings of the IWCS workshop on Foundations of Situated and Multimodal Communication
Nicholas Asher | Julie Hunter | Alex Lascarides
Proceedings of the IWCS workshop on Foundations of Situated and Multimodal Communication

2015

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Integrating Non-Linguistic Events into Discourse Structure
Julie Hunter | Nicholas Asher | Alex Lascarides
Proceedings of the 11th International Conference on Computational Semantics

2013

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Grounding Strategic Conversation: Using Negotiation Dialogues to Predict Trades in a Win-Lose Game
Anaïs Cadilhac | Nicholas Asher | Farah Benamara | Alex Lascarides
Proceedings of the 2013 Conference on Empirical Methods in Natural Language Processing

2012

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Multimodal Grammar Implementation
Katya Alahverdzhieva | Dan Flickinger | Alex Lascarides
Proceedings of the 2012 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies

2011

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Strategic Conversation
Alex Lascarides
Proceedings of the SIGDIAL 2011 Conference

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Commitments to Preferences in Dialogue
Anais Cadilhac | Nicholas Asher | Farah Benamara | Alex Lascarides
Proceedings of the SIGDIAL 2011 Conference

2009

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Proceedings of the 12th Conference of the European Chapter of the ACL (EACL 2009)
Alex Lascarides | Claire Gardent | Joakim Nivre
Proceedings of the 12th Conference of the European Chapter of the ACL (EACL 2009)

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A Logic of Semantic Representations for Shallow Parsing
Alexander Koller | Alex Lascarides
Proceedings of the 12th Conference of the European Chapter of the ACL (EACL 2009)

2008

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Agreement and Disputes in Dialogue
Alex Lascarides | Nicholas Asher
Proceedings of the 9th SIGdial Workshop on Discourse and Dialogue

2005

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Probabilistic Head-Driven Parsing for Discourse Structure
Jason Baldridge | Alex Lascarides
Proceedings of the Ninth Conference on Computational Natural Language Learning (CoNLL-2005)

2004

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Combining Hierarchical Clustering and Machine Learning to Predict High-Level Discourse Structure
Caroline Sporleder | Alex Lascarides
COLING 2004: Proceedings of the 20th International Conference on Computational Linguistics

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Inferring Sentence-internal Temporal Relations
Mirella Lapata | Alex Lascarides
Proceedings of the Human Language Technology Conference of the North American Chapter of the Association for Computational Linguistics: HLT-NAACL 2004

2003

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A Statistical Approach to the Semantics of Verb-Particles
Colin Bannard | Timothy Baldwin | Alex Lascarides
Proceedings of the ACL 2003 Workshop on Multiword Expressions: Analysis, Acquisition and Treatment

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The interpretation of non-sentential utterances in dialogue
David Schlangen | Alex Lascarides
Proceedings of the Fourth SIGdial Workshop of Discourse and Dialogue

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Detecting Novel Compounds: The Role of Distributional Evidence
Mirella Lapata | Alex Lascarides
10th Conference of the European Chapter of the Association for Computational Linguistics

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A Probabilistic Account of Logical Metonymy
Maria Lapata | Alex Lascarides
Computational Linguistics, Volume 29, Number 2, June 2003

2002

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XML-based NLP Tools for Analysing and Annotating Medical Language
Claire Grover | Ewan Klein | Mirella Lapata | Alex Lascarides
COLING-02: The 2nd Workshop on NLP and XML (NLPXML-2002)

2001

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An Algebra for Semantic Construction in Constraint-based Grammars
Ann Copestake | Alex Lascarides | Dan Flickinger
Proceedings of the 39th Annual Meeting of the Association for Computational Linguistics

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XML-Based Data Preparation for Robust Deep Parsing
Claire Grover | Alex Lascarides
Proceedings of the 39th Annual Meeting of the Association for Computational Linguistics

1999

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Ninth Conference of the European Chapter of the Association for Computational Linguistics
Henry S. Thompson | Alex Lascarides
Ninth Conference of the European Chapter of the Association for Computational Linguistics

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Default Representation in Constraint-based Frameworks
Alex Lascarides | Ann Copestake
Computational Linguistics, Volume 25, Number 1, March 1999

1997

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Intergrating Symbolic and Statistical Representations: The Lexicon Pragmatics Interface
Ann Copestake | Alex Lascarides
35th Annual Meeting of the Association for Computational Linguistics and 8th Conference of the European Chapter of the Association for Computational Linguistics

1994

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Intentions and Information in Discourse
Nicholas Asher | Alex Lascarides
32nd Annual Meeting of the Association for Computational Linguistics

1993

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A Semantics and Pragmatics for the Pluperfect
Alex Lascarides | Nicholas Asher
Sixth Conference of the European Chapter of the Association for Computational Linguistics

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Temporal Connectives in a Discourse Context
Alex Lascarides | Jon Oberlander
Sixth Conference of the European Chapter of the Association for Computational Linguistics

1992

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Inferring Discourse Relations in Context
Alex Lascarides | Nicholas Asher | Jon Oberlander
30th Annual Meeting of the Association for Computational Linguistics

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Preventing False Temporal Implicatures: Interactive Defaults for Text Generation
Jon Oberlander | Alex Lascarides
COLING 1992 Volume 2: The 15th International Conference on Computational Linguistics

1991

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Discourse Relations and Defeasible Knowledge
Alex Lascarides | Nicholas Asher
29th Annual Meeting of the Association for Computational Linguistics